fix: Avoid Windows path parsing issue

Extract path resolving and file name retrieval into a testable method.
Keep it private to avoid revealing internal API.

Author: travkin79

org.eclipse.lsp4e/src/org/eclipse/lsp4e/operations/symbols/internal/SymbolIconProviderRegistry.java

@@ -108,7 +108,7 @@ private SymbolIconProvider getIconProvider(Object symbol) {
 
 		String fileName = null;
 		try {
-			fileName = Path.of(uri.getPath()).getFileName().toString();
+			fileName = getFileName(uri);
 		} catch (Exception e) {
 			LanguageServerPlugin.logWarning("Failed to parse file name from URI " + uri, e); //$NON-NLS-1$
 			return defaultIconProvider;
@@ -129,6 +129,10 @@ private SymbolIconProvider getIconProvider(Object symbol) {
 		return defaultIconProvider;
 	}
 
+	private String getFileName(URI uri) {
+		return Path.of(uri).getFileName().toString();
+	}
+
 	private @Nullable URI getUri(Object symbol) {
 		return switch (symbol) {
 			case SymbolInformation info -> toUri(info.getLocation().getUri());